Ventilating system fob school-booms



E. M. McNMVIARA.

VENIILATING SYSTEM FOR SCHOOL ROOMS.

APPLICATION FlLED APR- 5. 1915.

- Patented Aug. 15, 1916.

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EM. IVIcNAlVlARA.

VENTILATlNG SYSTEM FOR SCHOOL ROOMS.

APPLICATION FILED APR. 5. 1915.

Patented Aug. 15, 1916.

E. M. MCNAMARA. VENTILATING SYSTEM FOR SCHOOL ROOMS.

APPLICATION FILED APR- 5. 19].).

Patented Aug. 15, 1916.

3 SHEETS-SHEET 3.

EDWARD M. IVIoNAll/IARA,

OF CHICAGO, ILLINOIS.

VENTILATING SYSTEM FOR SCHOOL-ROOMS.

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Specification of Letters Patent.

lPat entcd Aug. t5. tutti.

Application filed April 5, 1915. Serial No. 19.104.

has for its principal object to provide a.

simple and eflicient structural formation and combination of the schooldesk and associated seat, in which the hollow pedestal of the deskconstitutes an air duct or-passage providing a coacting element of theventilating means, in addition to the usual function of a desk support,and is adapted by its constru'ction to provide means for localindividual ventilation, with a direct passage for the exhaled'air to anopening of a discharge duct without commingling with the air exhaled byother pupils and therefore preventing a general vitiation of the air ofthe room.

In the accompanying drawings: Figure 1, is a perspective viewillustrating the general arrangement of a ventilating system, of theplenum type, for school rooms, and with the present improvement arrangedas a portion of the system. Fig. 2, is a longitudinal sectionalelevation of a combined desk and seat embodying the present invention,and illustrating its adaptation to the indirect system of ventilation,in which separate supply and return ducts conduct the air to and fromthe school room. Fig. 3, is a detached perspective view of the foot restor stool of the desk structure. Fig. 4, is a longitudinal sectionalelevation, illustrating the adaptation of the present improvements tothe plenum system of ventilating rooms, shown in Fig. 1. Fig. 5, is adetached perspective view of the vertical outer portion or board of thedesk structure.

Similar reference numerals indicate like parts in the several views.

Referring to the drawings, 1 designates the desk body having the usualslanting top board or portion, and a vertical outer portion or board 2,which in the present improvement is provided midway its length with anindividual air passage or duct 3. In the construction shown in Figs. 2,4 and 5, said air duct or passage 3 comprises a vertical channel in theinner side of the outer portion or board 2, with a plate or sheet 4 ofmetal or the like, closing the open side of the channel so formed. Theplate or sheet 4 having a horizontal extension at its lower end, toconstitute the bottom or web 5 of the desk body 1, as shown in Figs. 2and 4.

(i designates the lower or base member of the hollow pedestal upon whichthe desk body 1 is supported. Said base member 6 is formed with a lowerexpanded portion for fixed attachment to the floor, and preferably ofthe conical form shown, and is provided with a tubular vertical stem 7,that is externally screw-threaded, for the purpose hereinafter stated.The central duct or passage of said base member 6 has communication witha main duct of the ventilating system so as to either receive airtherefrom, or conduct air thereto, in accordance with the particularsystem to which the present invention is applied. A series of openings 8are formed in the conical wall of the base member 6 aforesaid. 9designates a correspondingly formed and orificed register collarsurrounding said base member, and adapted by a turning adjustment, toregulate communication through the series of openings 8, between theinterior of the school room and the central duct or passage of the basemember 6.

1O designates the upper member of the aforesaid pedestal, provided witha horizontal flange 11, for fixed attachment to the bottom or web 5 ofthe desk body 1. Tn the construction illustrated in Fig. 2, thevertically depending sleeve portion of said upper member 10 fits overthe vertical tubular stem 7, of the base member 6 aforesaid, and isinternally screw-threaded to engage the screw-threaded exterior of thestem 7, so that by a manual rotation of the upper member 10 and attacheddesk body 1, vertical adjustment of said parts in one direction or theother can be attained. The central duct or passage of said upper member10 has communication at its lower end with the central duct or passageof the base member 6 aforesaid while its upper end has communicationwith the before described air duct or passage 3 of the vertical outerportion or board 2 of the desk body 1.

12 designates a sleeve section or extension associated with the lowerend of the hollow pedestal aforesaid, adapted to partition the lowerexpanded portion of the interior of the pedestal into a central airchamber or duct which has longitudinal alinement with i the main duct orpassage of the pedestal to constitute an; extension thereof, and into anannular chamber or duct 13, the walls of which contain the registeropenings 8, above described.

With the above described construction and association of parts, asillustrated in Fig. 2, the sleeve or partition 12, connects the duct orpassage of the pedestal with an alr trunk or duct '14 beneath the schoolroom floor,

while the aforesaid annular chamber or duct 13 has connection with aseparate air trunk or duct 15, also benea'th'the school room floor, asshown. The construction is adapted for use inthat type of ventilatingsystems in which air is positively forced into, and positively withdrawnfrom the room by a combined pressure and exhaust apparatus. Inan'exhaust system of ventilating in which the air is exhausted locallyat or through the desks, the aforesaid sleeve section or ex tension 12will be removed, and the lower end of each desk pedestal connected tocom- .to offer a minimum amount mon exhaust main or air duct or trunkbeneath the floor as illustrated in Figs. 1 and 4. 16 designates a clampsleeve surrounding the vertically depending sleeve partion of the uppermember 10 ofthe desk pedestal, and clamped thereon at any requiredvertical adjustment by a clamping screw'17. Said clamp sleeve 16 acts asa pivot base for the seat connection now to be described.

18 designates a connecting frame having an approximately U form, andcomprising a pair of vertical members 19 and 20 connected together inspaced relation by a lower horizontal and extensible connecting member21, as shown. At its upper end the vertical member 19 has a yokeextension adapted for pivoted connection at 22with the aforesaid clampsleeve 16. Y The companion vertical member 20 is adapted for theattachment in an adjustable manner of the seat member of the desk, ashereinafter described in detail. The horizontal connecting member 21,aforesaid, is adapted to have close relation to the school room floor,and is preferably of.

a segmental form in cross-section, in order of obstruction to the feetof the pupil. 23 designates a foot rest or saddle, straddlingthehorizontal connecting member 21, and adapted to support the feet of thepupil a distance above the school room floor.

24 designates the pupils seat, associated in proper relation to the deskbody 1 and having the usual hinged back 25. In the present constructionthe seat 24 has pivotal or hinge connection 26 with the tubularsupportincg sleeve or standard now to be describe a 27 designates thetubular sleeve or standard above referred to, having an expanded upperend adapted to afford a substantial cal member 20 of the connectingframe 18,

in an adjustable manner, and in order to sult different slzes of pupils.

With the above described arrangement and pivotal connection of parts,the connecting frame 18, seat 24 and back 25, are adapted to swing fromtheir normal position of use, illustrated in full lines in Fig. 2, andin dotted lines in Fig. 4, into a position clear of the school roomfloor, illustrated in full lines in Fig. 4, with the seat 24 closing themouth of the cavity of the desk body 1, and with the back 25 restingabove the top of said desk body.

In the construction illustrated in Fig. 2, the vertical member 20aforesaid, is externally screw-threaded for engagement with thecorrespondingly screw-threaded bore of the tubular sleeve or standard 27aforesaid, and with an internal screwthread for adjustable engagementwith the stem portion of a floor-rest hereinafter described.

28 designates a lock sleeve or nut engaging the screw-threaded exteriorof the vertical member 20 aforesaid, and disposed beneath the tubularsleeve or standard 27, to afford means for locking the parts at therequired vertical adjustment.

29 designates the floor rest above referred to, and formed with avertical screw-threaded stem 30 adapted to engage the screwthreaded boreof the aforesaid vertical member 20, and provide means for effecting anadjustment of the floor rest 29in accordance with the verticaladjustment of the connecting frame 18 aforesaid and the asso ciated deskparts with which it has connection.

In the construction illustrated in Fig. 4, the aforesaid vertical member20, tubular sleeve or standard 27 and have a plain tubular form andtelescope one within the other, as shown. Said parts are held to therequired vertical adjustment by an expander cone or block 31, coactingwith longitudinally slitted ends of the sleeve 27 and stem 30, as usualin expanding fastenings-of the present type.

The vertical adjustment of the desk pedestal may be attained by a detailconstruction floor rest stem 30, v

of parts differing from that heretofore dedesignates an intermediatesleeve having a smooth bore, the lower portion of which slidingly fitsand is guidedupon the screwits contraction is effected to firmly holdthe depending sleeve portion 35 of an up-.

per member 36 of the desk pedestal in proper fixed relation. Otherwisesaid member 36, is similar in formation to the upper member 10 of saidpedestal heretofore described. 7

Having thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent, is

1. The combination, with an air trunk or duct; of a hollow pedestallocated above the air trunk or duct and providing an air duct orpasssage in communication therewith, and a desk-body surmounting thehollow pedestal and having an individual 'air duct or passage extendingupwardly from the air duct or passage of the hollow pedestal to a pointadjacent to the top of the desk body.

2. The combination, with air trunks or ducts; of a hollow pedestalhaving a lower or base member formed with a lower expanded portion incommunication with one air trunk or duct and having a series of openingsin the side walls thereof, and an orificed adjustable register collarsurrounding the lower expanded portion of the lower or base member ofthe hollow pedestal, a

sleeve section or extension providing com-- munication between the otherair trunk or duct and the air duct or passage of the hollow pedestal anda desk-body surmounting the hollow pedestal and having an individual airduct or passage extending upwardly from the air duct or passage of thehollow pedestal to a point adjacent to the top of the desk-body.

Signed at Chicago, Illinois this 1st day of April, 19-15.

EDWARD M. MCNAMARA.

